Device for removing scale and surface defects from steel while being rolled hot



May -19, 1925. 1,538,304

ING SCALE AND SURFACE DEFECTS J. L. SMITH a R l N m k R mm ZN a Q mi 2 M m wir m m m L .W

mm m :m

FROM STEEL WHILE BEING ROLLED H Flled May 25, 1923 DEVICE FOR REMOV HG ROLLED HOT J. L. SMITH DEVICE FOR REMOVING SCALE AND SURF-ACE DEFECTS Filed May 25 1925 FROM STEEL WHILE BE MWZMMX N iNVENTOR aivmidm/ffz ATTORNEY HHHHHHIWHI May 19, 1925.

flllllllL INVENTOR 'ffr.

JofmLc) ATTORNEY me SCALE mm summon DEFECTS,

DEVICE FOR REMOV FROM STEEL WHILE BEING ROLLED HOT Filed May 25, 1923 '7 Shest-Sheet 4 INVENTOR a 1 A4 John L. civil/l7. 1

BY ATTORNEY J L. SMETH v DEVICE FOR REMOVING SCALE AND SURFAGE DEFECTS 7 May 19, 1925.

FROM STEEL WHILE BEING ROLLED HOT Filed. May 25, 1935 7 Sheets-Sh'et 5 7' sheme shet 6 Q MEV SNVENTOR i1". cEW/ffi'.

BY W 51/ .WTQRNEY May 19, .1925.

. J. L. SMITH DEVICE FOR REMOVING SCALE AND SURFACE DEFECTS FROM STEEL WHILE BEING ROLLER 5301 Filed May 25, 192 5 May 19, 1925.

J. L. SMETH DEVICE FOR REMOV ING SCALE AND SURFACE DEFECTS FROM STEEL WHILE BEING R T OLLED HO Filed May 25, 1925 7 Sheats-$heet '1 kw w v 3 M ENVENTOR vfm'm .5. efiwlflr.

Patented May 19,

- umreo; m-res [PA-TENT OFFICE.-

Jon'n L. alarm, or HAMILTON, oN'raaIo, onnnnn.

' :oEvIc'E non, nmlovmescam AND summon DEFECTS rno vr s'rnnn WHILE name at Hamilton, in the Province of Ontario,"

Dominion of Canada5 have invented certain new and useful Improvements in Devices for Removin Scale and Surface Defects I from Steel ile Being Rolled H0t,- of which the followingis a specification.

, .The invention resides in the'provision of apparatusrfor removing surface defects from steel while being rolled hot, more especially .fiat rolled material including channels, and

The present invent-ion also has foran object to provide an apparatus which may be used in removing scale and surface defects from sheet bar; this scale, unlessremoved, Willi be rolled into the sheet and the scale so rolled into the sheet is during -the pickling process, removed with the result that the sheet will be left pitted and in a defective condition.-

g It is the object ofthis invention, to pr vide simple and effective means forgrp: moving the surface defects from such steel".

being rolled, and the invention particularly is directed'to the removal of defects from that particular class of rolled product known as flat material and the invention is .sufiiciently comprehensive to cover all flatrolled material, including channels, I beams, and in a manner whereby any of the flats, ofthe yarious types which may be acted u on by my invention, may liater be worke to an surface defects. v i The invention more particularly has for its object to provide a means whereby the product is cfiectively guided in its course into and out of the defect removing mechanisms, by removable bell mouths, tobe acted upon by suitable defect removing knives, each set coo 'erative with the other in a manner for e ectivelyremoving such defects, and capable of being moved inrelatiqn to each other for permitting the introduction of the rolled product'and also of being readily removed from thesupportmg housingthereoffor a repa r ,or replacement 'lhe invention ,fnrtherhas for its object upon reduce finished articles free of all scale Figures 9 ROLLED H0'I.

pplication filed m 25, 1923. Serial No. 641,453.

to provide suitable defect removing knives} readily, relnovably mounted within a hous-.

over the knives, and'means for moving the ing, means for gulding the. incoming product. .5

knives into cooperative relationwith' eachaf other and the moving product.

lVith the above and otherobjects view that-will hereinafter appear the invention residesin those novel details ofconstruction, combination and arran ement of parts,' all l of Winch will be first ullydeseribed, then.

be specifically pointed out in-the appended" claims and illustrated in theJacompanying i drawings, 1n-wh1ch:-

Figure 1 is a front elevationof my im proved defect removing apparatus, removed from the rolling stand; a 1n positlon in section.

Figure 2 is a side elevation of the shown Figum a portion of the flat;

ar being shown;

product being shownas passing through the: 7

apparatus and as being worked" upon byfai;

set of rolls.

Figure 3 is a plan view and-part horizontal section, that portion shown in plan being taken just below the cylinders, and-" that portion shown .in horizontal section .bein'g taken at approximately the working center line of the rolls.

Figure 4 is a vertical longitudinal section taken substantially on the line on Figurea M Figure 5' is a view illustrating diagrammatlcally the layout of a portion of a rolling mill showing the bed upon which the rolling 1 stands are mounted in series and illustrating single rolling stand with my'jinvention cooperativelymounted thereupon.

Figure 6 is a rear face view housing. v Figure 7 is a side'elevation thereof,-

being in longitudinal section.

Figure 8 is a plan view of the housing; 595* parts being broken away and in horizontal section. V .l

Figure 13 is a front elevation ofltli f lipper knife guiding member.

of the main parts"? and 10 are plan and'side' ele-e ioc' Figures 14 and 15 are face and side elevations respectively of an upper knife carrying plate member.

Figure 16 is a plan view of supporting base.

Figure 17 is a side elevation of one of the pivoted bell mouth forming members.

Figure 18 is a plan view of the member shown in Figure 17.

Figure, 19 is a plan view of one of the cylinders.

Figure 20 is a central longitudinal section of one of thee linders, a portion of one of the supporting posts being also shown.

Figure 21 isa detail view of one of cylinder supporting posts F igure' 22 is a diagrammatic view illustrating the position of the parts during the scraping or defect removing action."-

Figure 23 is a diagrammatic view illiis trating the position of the parts as the product enters my apparatus and before the knives have been set to the scraping or defect removing position.

Figure 24: is a side elevation of the apron actuating head.

Figure 25 is a actuating head.

Figure 26 is a front elevation of actuating head.

Figure 27 is a side elevation of one of the apron members.

Figure 28 is a detail cross section of the removable bottom plate. i

In the pi -actical embodiment of my in 'vention I provide a'base bracket 1 provided with side the rolling stand as is diagrammatically il-v lustrated in Figure 5.

The base bracket 1 has a rearwardly extending portion to which is secured theside flanges 3 of the main housing'which ineludes-side walls 4 and a rear wall 5 provided with an opening 6 surrounded on three sides by a guide flange 7 for accommodating, removably, a bell mouth member 8 which includes an apertured ear 9 for facilitating the removal thereof when desired.

At each side of its upper portion, the main housingincludes a pair of side casing portions 10, joined to form an open top by cross webs 11. Each of the casing portions 10 includes a longitudinal duct 12, each separate and independent of the other, a pair of threaded taps l3 and a single threaded tap 14. The threaded taps 13 are-in cross the housing the plan view of the apron the apron ..alig1n11ent with each other while the single threaded apertures 1% are in staggered rclation. The latter are each adapted. to receive an air or fluid pipe 15 in a manner and for the purpose later to be described.

The main housing also includes cutout portions 16 in the fore-portions of the up ears 2 adapted to be secured to.

posits sides thereof, vertical strengthening webs 1?, horizontal webs 18 merging therewith and aperturcd as at 19, and inwardly projecting machined. faces 20, the purpose of all of which will presently appear.

In the embodiment of my invention sllown in the drawings I provide a lower pair of stationary knives over which the product is adapted to move, and a movable pair of upper knives adapted to engage the upper surface of the product, and, for properly supporting, guiding and operating these knives in'proper relation for effecting the desired removal of the surface defects from the product being rollcd,-l provide a lower knife carrying member 22 adapted to rest upon the removable bottom member .21.

which said member includes outward pro-- ections with machined faces 23, cross bars to which the knives 25 are fixedly se cured by bolt and clamp means 26, and vertically projecting portions 27 upon which the knife guiding member 25% is rest in a manner hereinafter explained, see Figures 2, 4L and 12.

lhe upper knife guiding member 28 also includes projections and machined faces 29, cross bars 30, vertical guideways-il and lateral projecting lugs 32, the purpose for all of which will soonappear.

Cooperative with the vertical guideways 31 and cross bars of the upper knife guiding member 28, are a pair of knife carrying blades 33 to which the upper. knives 34 are scoured by clamp and bolt connections 35. The knife carrying blades also each include an u nvaril projection 36 provided with a. cutout portion or socket 37 adapted to accon'unodate the head of an operating rod 38 extending vertically from the socket 537 upward through the top of the housing, and through the gland 89 of the respective operating cylinder to be actuated by the piston ll to which it is secured and which operates vertically within the cylinder 40.

Each of the cylinders 40 are supported above the housing upon posts 42, each of which includes reduced and threaded end 43 adapted to be secured into the threaded taps 13 of each housing side, a reduced upper end 44- adapted to fit into the socket 45 formed in each of the lateral foot extensions of each cylinder 40, and'a further reduced and threaded portion 47 adapted to pass through the reduced aperture 48 in the adapted to nut 49, see Figures 1, 20 and 21.

Each of the posts 4:2, shown in detail in Figure 21, also includes a vertical duct 50, adapted to communicate with the respective longitudinal duct 12 of the housing side, and a lateral duct 51 adapted to communicate with either the air duct 52 of one of the foot portions 46 which communicates with the bottom of the cylinder or the duct of the other of such foot portions which communicates, through the enlargement 54-, witlrthe top portion of the cylinder, see Fign re 20.

As will later appear the upper set of the knives 34 are adapted to be moved toward or from the product being rolled in a vertical direction and means is provided for causing the vertically moving knives to eii'ect-a raising and lowering of the upper knife guiding member for a purpose later to be described. To accomplish this I provide the cross bars 30 of the guiding member with a plurality, one for each clamp belt, of vertical slotways 55 which allow a certain amount of vertical movement of the knives 34 without eflecting yertical movement of the guiding member h'ut'which are of such length. as

to cause alifting of said guiding member during a portion of the upwardmovement of said knife.

' At the front or entrant end of the housing I provide a pair of cooperating bell mouth members 56, each of which includes pivoting ears 57 having apertures registering with those 19 in the webs 18 of the main housing and which, when the ears 57 and the Webs 18 are cooperatively connected .by the pivot ill 58, make it possible to'swing the in'divi ualbell mouth membersoutw'ard to wholly open the front'of the housing, see

arrow and dot and dash lines on Figure -When the bell mouth members Q 6 are at their operative position, as shown in Figures 1, 2 and 3, the edges 59 of each-thereof abut i by the clamp nut 62.

By reference to Figures 2, 3, and 4 it will be observed that, in the operativecondition of my apparatus, the lower knife carrying member 22 rests upon the removable floor 21 with itsprojected and machined faces 23 engaging, in close but movable fit, the inwardly projecting and machined faces 20 of the. housing. The upper knife guiding member similarly fits within the housing with its outwardly projecting machined faces 29 e1}- gaging the faces 20 of the housing, and resting upon the said lower knife carrying member. It.will be ObSEI'WZd, especially from, Figure 3, that the fore-portionsofthe upperknife. guiding member 28' and the lower knife carrying member 22 project to a point on a plane with the front open face of the housing. For properly holding, in a removable manner, the said members 22 and 28 in operative relation within the housing, I provide each bell mouth member 56 with a heel portion 63 which, when the said bell mouth members are in their operative position shown in full lines in Figure 3, effectively serves to form abutmenis last which the said member may not be withdrawn except when the cross or clamprod is removed and each of the opposing bell mouth members swung to the open position in the manner indicated in dot and dash lines in the said Figure 3. Y o

Each of. the bell mouth members 56 also include'sa lower apertured bearing hub 64 which cooperates with the stud pivot 65, in pivotally supporting the apron member-6 6, which said apron member includes portion 67. i

The ears 57"of each of the bell mouth members 56' are eXtended'to form ears 68, apcrtured as at69, to receive, in a vertically mo\ able manner, an actuating rod which, includes a threaded portion 71, and an apex:-

acrank tured head at the lower end thereof adapted to accommodate the cross pin 7 3 fixed-to the crank portion 67 of each apron.

As hcreinbefore described the bottom knife members are stationary While the upper set of knife members" are moved toward or from the said bottom meinbers to effect'the, scraping or surface defect re-.

movingoperation or the cessation of the saidoperation as the 'case'may be. Inas-.

much as the bottom set of knives effect their surface defect removing result by reason of theproduct passing ther'eover, means must be provided at the outset of the operathis purpose I provide the apron members tion for lifting 'or directing the incoming end of the product over said knives and for 66. When the device is in-its normal or operating position the-japrons'lare dropped down to the position shown in Figure L and as diagrammatically shown in Figure 22, but when the product? is first entering the device to pass therethrough the apron members are lifted to the position diagrammatically' illustrated in Figure 23 to cause the said fast moving product to be directed freely over the bottom knives.

In order to eifectthis raising andlowering of the apron members I provide,- slidably mounted on'the pivot pin 58, an apron actuating head 7 4 which includes lateral fin-I gers 75 which engage,to be niov'ed by-and with, the lugs 32 of the knife guiding mem-- her 28 which projects laterally through the, cut-away portions 16 of the housin side walls 4, and which EilSOfiIlCllldG a sin e for;-

wardly projecting finger 76 secure ""up'on' the threaded portions 71 of the rod by clamp nuts 77,'seeFigures 1, 2, 2A: and 26.

By thus mounting the apron members 66 they are caused to move upwardly into the path of the travelling product by the upward movement of the pistons within the cylinders 4.0.

In Figure 5 is diagrammatically illustrated a lay-out of a series of rolling stands. in this figure the horizontal dot and dash lnes indicate the line of travel of the product while the vertical dot and dash lines indicate the positions of the individual sets of rolling stands in their proper successive relation upon the carrying bed. In this figure a single set oi rolls mounted on their rolling stand is illustrated in detail with my apparatus cooperatively mounted thereupon, and from this figure it will be observed that the clamping ears 2 o'f'the bracket 1 are secured to the casingZS of the rolling stand, the rolls themselves being indicated at 79 and the bed frame at 80.

While, in Figure 1, and in the rest of the drawings I have illustrated the invention,

the arrangement and number of cylinders" and their cooperative'relation with the housing, the apron members, and the knife blades may be varied in various manners within the scope of the invention pointe out in the appended claims.

Assuming the parts to be in the position diagrammatically illustrated in Figure F253, that is, with the pistons actuated to their uppermost limit under action of the fluid pressure through the respective pipe 15, the respective duct 12, the respective ducts 50, 51and 52, the upperset of knives will have been moved to their uppermost posit-ion carrying with them, during the last portion of their movement, the upper knife guiding member 28 by reason of the action of the clamping bolts 35in the vertical slotways 55 in said guiding member.

This lifting action or" the guiding member 28 eifects, through the action of the lugs 82, the fingers 75, head 72, finger 76 and rod 70, the lifting of the apron members to a position forcausing the product being rolled to pass freely over' the bottom stationary knives.

On the reversal of this action, that is, forcing down of the pistons 41 within the cvlinderslO under action of fluid pressure through :the respective pipe 15. duct 12, ducts 50, 51 and 53, the knives will be forced messes product passing through the apparatus and, simultaneously with the start of such downward movement, replace the aprons to their lowered positions allowing the product being rolled to rest upon and drag over the bottom set of defect removing knife members, see Figure 2.

By reason of constructing the various parts of my invention as hereinbefore described it will be readily understood that the rear bell mouth member may be readily removed for repair or replacement, that the knives may be readily removed for sharpening, repair or replacement, the apron and front bell mouth units may bereadily re placed and, by reason of hingedly mounting the said bell mouth members in cooperation with the open front face of the housing it" is readily apparent that the upper and lower sets of knives and their cooperating carrylng members and guiding members may be withdrawn bodily through the open frontof the housing for repair, replacement, or the v details of construction, the manner of oporation and the advantages of my invention will be readilv a parent to those skilled in the art to which it appertains.

iWhat I claim is:

1-. An apparatus of tlie class described comprising a lower stationary scraping means consisting -'ot a pair of scrapers spaced apart in the direction of movement of the work, an upper scraping means consisting of a corresponding pair of scraping elements associated with the lower scraping elements, means for moving the upper scraping elements toward and from the Inc lower scraping elements and means operated by the upward movement of such upper scraping elements for raising the approaching work clear of the lower scraping elements whereby the advance end of the Work will be prevented from engaging the lower scraper, thereby preventing cobbles forming in the bar.

2.- An apparatus of the class described -comprising a lower scraping means, an upper scraping means, means for moving said upper scraping means in cooperative relation with the said lower scraping means, and means for freeing the articl' eing passed through the apparatus from heaction of the scraping means at will.

downward into scraping relation with the 3. An apparatus of the class described comprising an upper scraping element, a lower scraping element, means for bringing together and for separating said scraping elements in cooperative relation, and means l5 forlifting'the article being passedthrough the apparatus free of the action of the scraping elements when said elements are separated.

4. Anapparatus of the class described comprising opposing surface scraping elements, apron members, and means for moving said elements toward or from each J; other in cooperative relation and for effecting a lifting of said apron members to free .15 the article being passed through the apparatus from the scraping elements.

51An apparatus of the class described comprising opposing surfacescraping elemerits, apron members, and means for mow nnd for effecting action of said apron membersto permit free movement, between the 'raping 1 elements, of the article being ,usiy with the movement of the scraping i'elements. 1 ;6.An apparatus of the class described comprising a lower stationary set. of-surface scraping knives including horizontal cutting edges over which the article being.

"passed through the apparatus is adapted to dr..g, an upper set of such knives vertically has an open front, means for mounting said 1 I housing ,on the frame of a rollin 5. means for supporting said scraping elements a mill,-

-within said housing, said last named means J being suchas to permit ready removal thereof through the open front of the housing substantially as shown and described.

, 8. An apparatus of the class described [comprising a plurality of surface scraping has an' open frbntfmea'ns for supporting said -scraping felement's, said last named moval thereof through the open front of the 1 said housing, and movable means for obstructing the ready removal of said supp"orting means. Y I I .9, n -apparatus of the class described rising aplurality of surface scraping ingsaid elements with relation to each other .assed through the apparatus simultaneovable in cooperative relation with. the

elements, a housihgfor's'aid elements which zo bfmeans beingsuchjas to enable'ready reelements, a housing for said elements which has an open front, means for supporting said scraping elements, said last named means being such as to enable ready removal thereof-through the open front of the saidcomprising a plurality of surface scraping.

elemcnts,.a housing for said elements which has an open front, means for supporting said scraping elements said last name means being such as to enable ready removal thereof through the open front of thesaid housing, and front bell mouth forming elements including heel portions adapted to retain the said supporting means within the housing, means for hingedly mounting one such month forming element at each side of the epe'n front of the housing, and means for clamping said elements together at the supporting-means-securing POSltlOIL V 11. An apparatus of the class described comprising a housing, a bracket supporting said housing, a bell mouth removably mounted upon said housing, and scraping elements within said housing. t-

12. An apparatus of the class described comprising a housing including an entrance and an exit, a bracket sup housing, a bell mouth remov-a 1y mounted cooperative with the exit of said housing, scraping elements within said housin and bell mouth forming members hing y secured to saidhousing cooperative with the entrance thereof.

13. An apparatus of the class described comprising a housing including a rear wall having an exit, an open front and an open bottom, a bracket for supporting said housrting said ing, a removable floor supported bysaid bracket, a bell mouth removably mounted, Tcooperative with said exit, scrapingelements in said housing, and bell mouth forming members hin dly mounted upon said housing cooperative with the open front thereo .I I

" 14. An apparatus of the class described comprising a housing including a rear wall ing, a removable floor supportedby said bracket, a bell mouth removably'mounted,

cooperative with said exit, lower surfacescraping elements within said housing, up- I having; an exit, an open front and an open bottom, a bracket for supporting saidhousmembers pivotally, mounted upon said housing' cooperative with the 0 en front thereof,

er scraping elements and the apron memers.= i

- and means for raising an lowering the upuse 15. An apparatus of the class (ltSClibtXl comprising a housing having an open front and an opening at its rear, a lower scraper knife carrying member slidable through the open front of the housing, knife blades secured to said carrying member, an upper set of knife carrying plates, an upper knife supporting and guiding men'iber adapt ed to support and guide the said canrying plates, and to restupon the said lower knife carrying member and to be slidablc through the said open front of the housing, means for moving the upper set of mixes with relation to the lower knives, apron members adapted to norn'ially lie in a. plane beneath the line of travel of the article being passed through the apparatus, and means for lifting said apron members simultaneously With the full lifting action of said upper knives. 7

36. An apparatus of the class described comprising a lower stationary set of sur face scraping knives including horizontal cutting edges over which the product being passed through the apparatus adapted to d 'ag, anupper set of such knives vertically movable in cooperative relation with the lower knives, means for moving said movable knives, apron members adapted to lie bencath the plane of travel of the product bein passed through the apparatus, and means operable simultaiueously with the moving of the movable knives for lifting said aprons to engage and free the article being passed through the apparatus from scraping relation with the lower stationary knives, and means for adjusting the degree of lift of said apron lifting means.

17. An apparatus of the class described comprising a housing including an entrance and an exit and a pair of opposite fluid ducts, a lower stationary set of scraper elements within said housing, an upper set of movable scraper elements within said housing, working cylinders supported u u said housing, pistons within said cylinders, piston rods secured to said pistons and re movably secured to said movable scraper elements and means whereby .fiuid pressure is directed from a source of supply through one of the housing ducts into one portion of the working cylinders to force the pistons downwardly and whereby fluid pressure is directed from the other housing duct into anotherportion or said working cylinders to "force the pistons upwardly.

18. An apparatus of the class described comprising a housing including an entrance and an exit and a pair or" opposite fluid ducts, a lower stationary set of scraper elements within said housing, an upper set of movablescraper elements within said housing, working cylinders supported upon said ousin pistons within said cylinders, piston rods secured to said pistons and removset ably secured to said movable scraper elements and means whereby fluid pressure is directed from a source of supply through one of the housing ducts into one portidn of the working cylinders to force the pistons downwardly and whereby fluid pressure is directed from the other housing duct into another portion of said Working cylinders to force the pistons upwardly, apron members pivotally mounted cooperative with the entrance of said housing, and means actuated by the raising and lowering of the movable scraper elements for raising and lowering said aprons,

19. In apparatus of the classxlescribed, upper and lower scrapers between which the article being passed through the apparatus to be scrape-d is passed, scraper separating means and lifting means to lift the article over the lower scrapers out of contact therewith.

20. In apparatus of the class described, a fixed housing having a chamber with an entrant and exit passage, upper and lower knife carrying frames held within the housing chamber and insertable and withdrawable through the entrant passage thereof and means to-secure said housing of the frame to a rolling mill.

21. In apparatus of the class described, a fixed housing having a chamber with an entrant and exit passage, upper and lower knife carrying frames held within the housing chamber and insertable and withdrawablc through the entrant passage thereof, and means for operating the knives and means to secure said housing of the frame to a rolling mill.

In apparatus of the -class described, a lixcdhousmg having a chamber with an entrant and exit passage, upper and lower knife carrying frames held Within the housing chamber and insertable and Withdrawable through the entrant passage thereof, bell mouth members constituting an entrance to said entrant passage and means to secure said housing of the frame to a rolling mill.

23, In apparatus of the class described, a fixed housing having a chamber with an entrant and exit passage, upper and lower knife carrying frames held-within the housing chamber and insertable and withdrawable through the entrant passage thereof, bell mouth members constituting an entrance to said entrant passage, means mounting said bell mouth members to retain said knife carrying frames in place and permit their removal at times.

as. In apparatus of the class described in fixed housing having a chamber with an entrant and exit passage, upper and lower knife carrying frames held within the housing chamber and insertable and withdrawable through the entrant passa e thereof,

. com prising a cooperative with said exit,

messes means for operating the knives, and a raisiug mechanism cooperating with. said knife operating means whereby when said knives are separated the approaching article will be raised over and be freed ot the lower knives.

In apparatus of the class described, ihe combination with upper and lower scraper knives and means to raise and lower the upper knives, of a lifting apron to elevate and direct the article being passed through the apparatus over the lower knife.

26. An apparatus of the class deseril'ied comprising a housing including an entrance a ud an exit, a bracket supporting said housing, a bell mouth rcniovably mounted to operative with the exit of said housing, scraping elements Within said housing, and bell mouth forming members hingedly secured to said housing cooperative with the entrance thereof, and a lifting apron to liftand guide the article being passed through the apparatus into the housing free of the scraping elements.

27. An apparatus of the class described housing including a rear wall having an exit, an open front and an open bottom, a bracket for supporting said hous ing, a removable floor supported by said bracket, a bell mouth reiuovably mounted,

scrz'iping elenieuts Within said housing, and bell mouth foriniug members hingedly mounted upon said housiiw cooperative with the open front thereo and a lifting apron to lift and guide the article being passed through the apparatus into the housing free of the scrap ing elements.

28,- An apparatus of the class described comprising a housing including a rear wall having an exit, an open front and an open bottom, a bracket for supporting said houshis, a l'tlllOVZlblG floor supported by said bracket, a bell mouth rcniovab-ly mounted, cooperative with said exit, lower surface scraping elements within said housing, upper surface scraping elements within said l'iousing, bell mouth forming members hingedly mounted upon said housing, an apron pivotally mounted upon said housing cooperative with the open front thereof, and means for raising and lowering the upper scraping elements and the apron.

29. In apparatus of the class described, a housing, scraper elements carried thereby, said housing having a passage therethrough with an entrance and an exit, a sectional bell mouth, and means for swingably mounting said hell mouth sections on the housin z 30.111 apparatus of the class described, a housin scraperlelements carried thereby,

said housing having a passage therethrough with an entrance and an exit, a sectional bell rnout-h inoyably mounted on the housing, and an apron mounted on the bell mouth, and means to raise and lower said apron into and out of engagement with the article being passed through the apparatus.

31. An apparatus. of the class described, upper and lower scrapers between which the article to be scraped is passed, scraper supporting means, article lifting meanslm eated in advance of the scrapers to lift the article approaching the scrapers over the lower scrapers out of contact therewith, and means to operate said liftin means, substantially as shown and described,

- JOHN L. SMIT 

